Improvement in dental engines



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W. W. EVANS.

- DENTAL-ENGINE. NID-159,347. Patented Nay-.2,1875

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W. W. EVANS. DENTAL-ENGINE.

Patented'Nov.z,1a75.

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By 7 Attorney UNITED STATES PATEIvf'I' WILLIAM WARRINGTON EVANS, on enonpenro wir, DISTRICT' or COLUMBIA,

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'lMPRYovEMENY-r |N pENTALfEINelNEs. l

Specification forming part of 4Letters Patent'No. dated NovemberQ, 7,1875; I application filed .Iu1y15,'1s75.

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To all whom, it may concern:

Be it known th at I, WILLIAM WARRINGTON EVANS, of Georgetown, in `the District of Columbia, have invented certain new and useful Improvements in Dental Engines, of which the following is a specification:

My invention relates to dental engines of that class adapted to be driven by waterpower. Its objects are-to secure a compact, simple, and ecient water-motor adapted to be mounted on the operators table, and capable of being readily controlled by the operator, and to combine therewith a tool having great freedom of movement.

My present vinvention constitutes an improvement on the dental engine for which Letters Patent of the United Siates, No. 151,653, were granted to me June 2, 1874.

The subject-matter claimed will hereinafter specically be designated.

In the accompanying drawings, Figure l represents a view, partly in section, of my improved apparatus, showinga-exible shaft driven by gearing; Fig. 2, a horizontal section therethrough on the line a: :v of Fig. l 5 Fig. 3, a vertical section through the battery or abutment ring. Fig. lrepresents a view, similar to that shown in Fig. l, of a modification of my invention with the iexible shaft attached directly to the motor-shaft 5 Fig. 5, a horizontal section on the line y y of Fig. 4; and Fig. 6,

`a vertical section through the battery or abutment ring.

The casing A of the `motor is shown as provided with a screw, a, by which it may be coupled to a tubular post, bracket, table, or other suitable support, in convenient Vproximity to the dentists chair. The supply-pipe B is secured centrally in the casing, an annular space, K, being left between them for the escape of the waste water. The reaction- Wheel C, shown in Fig. 3, turns in bearings on a shoulder, b, on the supply-pipe, its spindle c passing upward through the casing, and through a post, D, mounted thereon. A battery or abutment ring, L, surrounds the wheel, its abutments l being inclined somewhat from the perpendicular, as shown. The upward thrust of the wheel -incident to `this mode of construction is borne by a set-screw, d, on the post D, which bears on the spindle c. A bevelgear, E, lixed on this spindle bya set-screw,e, drives a corresponding pinion, F, on a countershaft, f, turning in long pipe-box bearings G, mounted in a bracket-frame, H, capable of swinging freely around the post D. A iiexible sheath, H', is connected at one end `with the pipe-box bearin gs, and at the other with a hand-piece, I. A ilexible shaft, J, connects the counter-shaft with a tool mounted in thehand-piece. The construction of these parts being well understood need not be'more particularly described herein. As the bracket swings around the post, and the sheath and shaft are both flexible, great freedom of movement is imparted to the tool. The water escapes from the feed-pipe through the lateral openings b at its upper end, and passes through the chutes Q of the wheel, impinges upon the abutments Z of the battery L, and

escapes downward from the casing through v the annular waste-way K, which connects with a suitable pipe. i

I have found such a wheel in practice to do its work quietly, steadily, and efciently.

While myimproved motor ismore especially adapted for light work it is obviously capable of being enlarged, and thus adapted to do heavier work with good effect. In such large wheels the supply-pipe could be brought 1' n laterally under the wheel, instead of perpendicularly, as shown in the drawing. The dotted lines in Fig. l show this pipe M. The pressure of the water being upward tends to lift the wheel, and thus cause it to run very lightly, while the inclination of the abutments lof the battery tends to deflect the water downward, and thus secures its rapid discharge after having done its work. The wheel shown in Figs.

et, 5, and 6 is like the other, except that the number of abutments l are somewhat greater, and that a bearing, b2, is formed in the top of the supply-pipe, on which the step c2 of the water-wheel rests, thus insuring the lsteady running of the wheel. The Ilexible shaft is,'in this instance, coupled in a usual well-known wheel; while the Way directly to the spindle c of the waterflexible sheath is secured upon a collar, D', turning freely on a post, D, and held thereon by a check-screw, thus permitting the sheath and. hand-piece to turn y freely. l

I claim as of my oWn invention- 1. The combination, substantially as hereinbefore set forth, of the casing, the supplypipe, the Wheel revolving on the supply-pipe,

the chutes, and the battery for the purposes specified.

2. The combination, substantially as hereinv before setforth, of the casing, the supplypipe, the'wheel, its spindle, the post on the casing, the flexible sheath, and the e'xible Y shaft.

3. The combination, substantially as hereinbefore set forth, in a dental engine, of the casing, the Water-Wheel revolving therein, and

W. WARRINGTON EVANS.

Witnesses:

WM. D. BALDWN, E. C. DAVIDSON. 

